Fastening foe dooes



AMOS CALL, OF SPRINGFIELD, MASSACHUSETTS.

FASTENING FOR DOORS.

Specicaton of Letters Patent No. 4,40*?, dated March 7, 1846.

To all whom 25 may concern:

Be it known that I, AMOS CALL, of Springfield, in the county of Hampdenand State of Massachusetts, have invented a new and useful 'Improvementin Night, or Safety Latches, and that the following is a full, clear,and eXact description of the principle or character thereof whichdistinguishes it from all other things before known, and of the mannerof making, constructing, and using the same, reference being had to theaccompanying drawings, making part of this specification, in which-Figure 1 is a perspective view of the lock with the escutcheons removed;and Fig. 2, the spindle and one of the knobs detached therefrom.

The same letters indicate like parts in' both figures.

The invention consists in having one of the knobs of the latch so fixed,as that it can be connected with the tumbler, or disconnected atpleasure; and when on the outside of a door, it can be controlled by aperson inside, while the inside knob is so afiixed to the spindle, asalways to act on the tumbler in the usual way. This improvement can beapplied to all varieties of latches moved by a revolving spindle andtumbler.

In the accompanying drawings (A) is the shell of a common mortise latch,and (a) is the inside knob, attached in the usual way to the spindle (b)in o-ne side of the shank of the knob there is an oblong mortise or slit(c), in which a bolt (d) slides parallel with the spindle, and partlysunk in, and guided by a groove cut in said spindle; the thumb piece ofsaid bolt stands out at right angles from the shank of the lmob as shownin the drawing (d). On the opposite end of t-he spindle to knob (a), aknob (e) is attached so as to turn freely on the spindle; this lastnamed knob has fo-ur, (more or less), slits or notches (f) cut into itsshank Aat the end next the door, and at the end the spaces between theslits are chamfered off nearly t0 an edge as clearly shown'in thedetached knob FigQQ. When the spindle is in place and the bolt (d) drawnback, the knob (e) will turn without moving the spindie and therefore aperson on that side of the doo-r to which it is attached would beeffectually prevented from drawing the bolt of the latch, but if thebolt (CZ) is pushed up, the end of it (which Yis brought to an edge byhaving its corners chamfered of) enters one of the slits (f) in theshank of the knob and the spindle is at once afhxed to it. It will beseen by having a number of slits and the corners of the pieces broughtto an edge between them that the bolt can be pushed into one of themwhen the knob is in any position, which would not be the case if therewas only one slit that would require the knob to be turned so as tobring it opposite the bolt.

Having thus fully described my improvement, what I claim as my inventionand desire to secure by Letters Patent is- Connecting the knob of alatch with th spindle in such a w'ay as that it can be made to turneither with or without the spindle by means of a bolt acted on on theopposite side of the door to control the action of said knob,substantially in the manner and for the purpose herein set forth.

AMOS CALL.

Witnesses:

JosIAH HOOKER, RHoDoLPHUs KINSLY.

